Where: Guizhou, China (25.6° N, 106.2° E: paleocoordinates 4.7° S, 97.1° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Houziguan Formation, Wordian (266.9 - 264.3 Ma)

• Member XII, at the top of the Houziguan Formation, which is stratigraphically equal to the top of the Maokou Formation in the platform interior. The ammonoid collection presumably comes from a little below Bed 29 in the Shaiwa section (Sec. IV-IV’), but still correlates with the Waagenoceras sp. representatives of the Waagenoceras sp.-Propinacoceras beyrichi Zone, which is Wordian in age biostratigraphically.

• group of beds-level stratigraphic resolution

Environment/lithology: basinal (); lithified claystone

Size class: macrofossils

Reposited in the NIGPAS

Primary reference: Z. R. Zhou. 2017. Permian basinal ammonoid sequence in Nanpanjiang area of South China - possible overlap between basinal Guadalupian and platform-based Lopingian. Journal of Paleontology 91(Memoir 74):1-95 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 185584: authorized by Matthew Clapham, entered by Matthew Clapham on 29.04.2017

Creative Commons license: CC BY (attribution)